JP2015076395A - Plasma torch nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma torch nozzle which facilitates replacement of a torch nozzle by coupling the torch nozzle made of a graphite material to a front electrode of a plasma torch with bolts.SOLUTION: A torch nozzle 8 is fixedly installed on a front electrode of a plasma torch with bolts. Graphite, which is used as a consumable member without additional cooling and is inexpensive, is used as a material of the torch nozzle 8.

Description

  The present invention relates to a plasma torch nozzle, and more particularly to a plasma torch nozzle in which a graphite torch nozzle is installed at a front electrode of the plasma torch.

  In general, thermal plasma is used for waste treatment, development of new materials, removal of harmful gases, and the like.

  The core of such thermal plasma is related to a plasma torch that generates ultra-high temperature plasma, and a hollow type DC arc plasma torch is most often used as the plasma torch.

  Here, the cavity type plasma torch has an electrode for generating a DC arc inside, and the inside of this electrode can give necessary characteristics while constraining plasma which is a super-high temperature conductive fluid, The interior space of the front electrode and the rear electrode is specially designed, and is connected to the front electrode of the torch nozzle (nozzle) so that the fluid arc spot is concentrated inside, and finally the plasma It serves as a guide to spit out the outside.

  In particular, the plasma torch uses an oxygen-free copper (OPC) material electrode and an electrode nozzle in order to facilitate ignition of an arc.

  However, the front electrode and the electrode nozzle of the oxygen-free copper material as described above are rapidly eroded by high-temperature arc heat in that a direct current arc spot is concentrated during plasma generation.

  Also, in the case of a reverse polarity torch, the erosion at the cathode spot is larger than that at the anode spot.

  In the melting furnace system using the plasma torch, the front electrode portion of the oxygen-free copper torch is inserted into the melting furnace and operated, so that the outside is exposed to a high temperature plasma atmosphere.

  Therefore, since water cooling is always required to reduce the consumption rate of the front part of the torch, there is a problem that the thermal efficiency of the plasma torch is lowered.

  In addition, the behavior of plasma in the melting furnace is less reproducible and always highly uncertain, and the torch nozzle exposed in such a situation is easily damaged by a small abnormal discharge (cooling channel). .

  In this case, there is a situation in which the operation must be interrupted and the nozzles must be replaced, thereby reducing the operation efficiency.

  Oxygen-free copper is expensive to produce and difficult to process into a nozzle, so the parts are expensive and the overall economy is reduced.

  A conventional plasma torch oxygen-free copper electrode nozzle is not only expensive, but also has a problem that it is difficult to use during a desired life due to abnormal discharge, which lowers the operating efficiency and economy of the facility.

  Accordingly, the present invention has been made to solve the above-described problems, and a plasma torch nozzle that facilitates replacement of a torch nozzle by connecting a graphite torch nozzle to the front electrode of the plasma torch with a bolt. The purpose is to provide.

  In order to achieve the above object, the plasma torch nozzle according to the present invention is characterized in that the torch nozzle is fixedly installed on the front electrode of the plasma torch with a bolt.

As described above, the plasma torch nozzle according to the present invention has the following effects.
First, the present invention does not have a cooling channel inside, and instead can be periodically replaced after a certain period of use, so that the plasma torch operation safety is improved while fundamentally improving the thermal efficiency of the plasma torch. In addition, there is an effect that it is possible to improve the facility utilization rate, the operational economy, etc. in an innovative manner.

  Second, the present invention is a low-consumable graphite material nozzle that can be replaced periodically after a short period of time without additional cooling. There is an advantage that can be secured.

1 is a schematic view showing a plasma torch nozzle according to the present invention. It is the schematic which shows the plasma torch with which the plasma torch nozzle by this invention was applied. FIG. 3 is a structural diagram showing a front electrode of the plasma torch of FIG. 2.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic view showing a plasma torch nozzle according to the present invention.
As shown in the figure, in the plasma torch nozzle 8 according to the present invention, the torch nozzle 8 is fixedly installed on the front electrode 1 of the plasma torch with a bolt 11.

Here, the torch nozzle 8 is made of graphite.
That is, the plasma torch nozzle 8 according to the present invention is a member where the front electrode 1 of the plasma torch is extended, and an arc spot is concentrated inside the plasma generation.

Here, the plasma front electrode 1 and the torch nozzle 8 function to constrain plasma, which is a high-temperature fluid, to give desired characteristics.
Particularly, the plasma torch nozzle 8 is connected to the front electrode 1 of the plasma torch by a bolt 11.

  Therefore, since the plasma torch nozzle 8 according to the present invention is made of a graphite material, it can be used as a consumable member without additional cooling, the outside is exposed to high temperature plasma, and the inside is gradually eroded by a high temperature arc spot, to a certain extent. When worn out, the bolt can be loosened and replaced with a new torch nozzle 8 for use.

  FIG. 2 is a schematic view showing a plasma torch to which a plasma torch nozzle according to the present invention is applied, and FIG. 3 is a structural view showing a front electrode of FIG.

  As shown in the figure, the plasma torch nozzle 8 according to the present invention is a member where the plasma front electrode 1 is extended, and an arc spot is concentrated inside the plasma when it is generated.

  Here, the plasma front electrode 1 and the torch nozzle 8 function to constrain plasma, which is a high-temperature fluid, to give desired characteristics.

  In particular, the plasma torch nozzle 8 according to the present invention has a structure that is coupled to the front electrode 1 of the plasma torch by a bolt 11.

  Here, during operation using high-temperature plasma, the plasma front electrode 1 is inserted into a melting furnace (or reaction furnace), and the whole is exposed to a high-temperature arc.

  In addition, the plasma torch housing 4 is not only electrically insulated, but also circulates cooling water therein to prevent external damage in a high-temperature plasma state.

  The present invention can be applied to a plasma torch nozzle in which a graphite torch nozzle is installed on the front electrode of the plasma torch.

DESCRIPTION OF SYMBOLS 1 Front electrode of plasma torch 2 Cavity type front electrode 3 Cavity type rear electrode 4 Plasma torch housing 5 Electrode cooling water connection part 6 DC power supply connection part 7 Plasma gas connection part 8 Plasma torch nozzle 9, 10 Plasma nozzle installation 11 Volt

Claims (2)

  A plasma torch nozzle, characterized in that a torch nozzle (8) is fixedly installed on a front electrode (1) of the plasma torch with bolts (11). The plasma torch nozzle according to claim 1, characterized in that the torch nozzle (8) is made of graphite.